31712617 has 2 divisors, whose sum is σ = 31712618. Its totient is φ = 31712616.

The previous prime is 31712609. The next prime is 31712621. The reversal of 31712617 is 71621713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21058921 + 10653696 = 4589^2 + 3264^2 .

It is an emirp because it is prime and its reverse (71621713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31712617 - 2³ = 31712609 is a prime.

It is not a weakly prime, because it can be changed into another prime (31712627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15856308 + 15856309.

It is an arithmetic number, because the mean of its divisors is an integer number (15856309).

Almost surely, 2^31712617 is an apocalyptic number.

It is an amenable number.

31712617 is a deficient number, since it is larger than the sum of its proper divisors (1).

31712617 is an equidigital number, since it uses as much as digits as its factorization.

31712617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 28.

The square root of 31712617 is about 5631.3956529443. The cubic root of 31712617 is about 316.5269508615.

The spelling of 31712617 in words is "thirty-one million, seven hundred twelve thousand, six hundred seventeen".